Lennox G61MPV Service Manual page 70

High Altitude
Orifice Kit
Natural Gas
Input
Only
7501−10,000 ft. 2000−4500 ft.
−045 44W51
−070 44W51
−071 44W51
−090 44W51
−091 47M82
−110 44W51
−111 47M82
−135 44W51
1
High Altitude Orifice Kit is required and must be ordered separately for applications from 7501 to 10,000 ft.
G− Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustion. See sections D− and E−. Take combustion sample
beyond the flue outlet and compare to the following tables.
The maximum carbon monoxide reading should not ex-
ceed 100 ppm.
TABLE 42
High Heat
Unit
G61MPV−36B−045
G61MPV−36B−070
G61MPV−36B−071
G61MPV−36C−090
G61MPV−60C−090
G61MPV−60C−091
G61MPV−60C−110
G61MPV−60C−111
G61MPV−60D−135
TABLE 43
Low Heat
Unit
G61MPV−36B−045
G61MPV−36B−070
G61MPV−36B−071
G61MPV−36C−090
G61MPV−60C−090
G61MPV−60C−091
G61MPV−60C−110
G61MPV−60C−111
G61MPV−60D−135
Conversion Kit Requirements
High Altitude Pressure Switch Kit
ORDER TWO EACH
4501−7500 ft.
− − − − − −
− − − − − −
75M22 75M22
− − − 75M22
26W85 26W85
− − − 56M23
56M22 56M22
− − − 56M93
CO % CO %
2 For Nat 2 For L.P.
6.0 − 7.0 6.9 − 7.9
6.5 − 7.6 7.4 − 8.4
6.9 − 8.2 8.3 − 9.8
6.9 − 8.0 7.8 − 8.8
6.7 − 7.7 7.8 − 8.8
7.6 − 8.9 8.7 − 10.2
7.2 − 8.2 8.1 − 9.1
7.5 − 8.8 8.7 − 10.2
7.4 − 8.5 8.3 − 9.3
CO % CO %
2 For Nat 2 For L.P.
4.3 − 5.3 4.8 − 5.8
4.8 − 5.8 5.3 − 6.3
5.0 − 6.2 5.7 − 7.0
5.1 − 6.5 5.9 − 6.9
5.1 − 6.5 5.9 − 6.9
5.4 − 6.7 6.2 − 7.4
5.3 − 6.5 6.1 − 7.1
5.3 − 6.5 6.1 − 7.4
6.5 − 7.5 6.7 − 7.7
TABLE 41
LPG/Propane Kit
7501−10,000 ft. 0−7500 ft.
− − − 44W48
56M23 44W48
56M21 44W48
56M21 44W48
26W86 44W48
75M22 44W48
56M23 44W48
56M93 44W48
H− Condensate pH Range
The condensate is mildly acidic and can be measured with
pH indicators. The pH scale is a measurement of acidity
and alkalinity. The following scale shows the relative pH of
some common liquids as compared with condensate of
G61MPV units. The concentration of the acidity of all these
fluids including the condensate is very low and harmless.
0
1
2
Increasing
3
Acidity
4
5
6
7
8
Increasing
9
Alkalinity
10
11
Page 70
LPG/Propane to
Natural Gas Kit
7501−10,000 ft. 0−7500 ft.
44W50 44W49
44W50 44W49
44W50 44W49
44W50 44W49
44W50 44W49
44W50 44W49
44W50 44W49
44W50 44W49
pH RANGE
Vinegar
G61 Condensate
Wine
Orange Juice
Tomato Juice
Tap Water
1
7501−10,000 ft.
44W49 + 44W51
44W49 + 44W51
44W49 + 44W51
44W49 + 44W51
44W49 + 47M82
44W49 + 44W51
44W49 + 47M82
44W49 + 44W51
pH Range